VMS Help SORT, /KEY, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ SORT/KEY=(POS:16,SIZ:3)/KEY=(POS:1,SIZ:11) -
  _$ /KEY=(POS:40,SIZ:2,DESC) YRENDAVG.DAT YRAVGSRT.LIS

      This SORT command identifies three key fields. The input file,
      YRENDAVG, is first sorted by the key beginning in position
      16, then by the key beginning in position 1, and finally by
      the key beginning in position 40. The third key used sorts in
      descending order.